Java negative int to hex and back fails

Question

public class Main3 {
    public static void main(String[] args) {
        Integer min = Integer.MIN_VALUE;
        String minHex = Integer.toHexString(Integer.MIN_VA         


        

Answer 1

You need to include a negative sign.

I don't have access to test this right now but I'd bet if you tried this value instead:

Integer min = Integer.MIN_VALUE + 1;

It wouldn't bomb, but would give you a positive number (not negative) when you ran ParseInt(min,16).

A string of bits doesn't really have enough info to determine sign in this context so you need to provide it. (consider the case where you use min = "F". Is that +/-F? If you converted it to bits and saw 1111, and you knew it was a byte, you might conclude that it's negative, but that's a lot of ifs.